*{margin: 0;padding: 0;}
.box{
    width: 100%;
    height: 600px;
    background-color: gainsboro;
    display: flex;
    justify-content: center;
    align-items: center;
}
.box>.reg{
    width: 500px;
    height: 300px;
    background-color: ghostwhite;
}
.box>.reg>h1{
    text-align: center;
}
.box>.reg>.username,.pwd{
    margin-left: 20px;
   
}
tr{
    height: 30px;
}
.btn{
    margin-left: 60px;
    margin-top: 20px;
}
